Jerry, I had similar experiences with the Mowat sensor as you did with the Sonic guide; I can't recall seeing a Sonic guide though; was it more audible than tactile? I had training with the Mowat from an instructor who came to my work place; we worked in the large plaza, which was surrounded by eight buildings that had windows looking out on it, so we had quite an audience of people who approached me after the training sessions and asked tons of questions about what in the world was going on. It was spring at the time and I suspect they really wanted to be outside as we were. I think they really got curious when I was learning how to navigate bewteen and around trees and other objects. Mary to view the list archives, go to: www.freelists.org/archives/optacon-l To unsubscribe at any time, just send a message to: optacon-l-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the message subject. Tell your friends about the list. They can subscribe by sending a message to: optacon-l-request@xxxxxxxxxxxxx with the word "subscribe" (without the quotes) in the message subject.